37
307–920
DISPLACEMENT PUMP REPAIR
3. Tighten the packing retaining nut (214) onto the pis-
ton valve. See the TORQUE note in Fig 29.
Note the alignment
of the piston (224) to the pack-
ing retainer nut (214). Maintain this
alignment
through Steps 5, 6 and 7.
4. Place the ball (203*) on the piston valve (224).
See
Fig 29.
Fig 28
214
F
218*
LIPS OF
V–PACKING IN
THROAT MUST
FACE DOWN
217*
LIPS OF
V–PACKING IN
PISTON MUST
FACE UP
216
213*
205*
LIPS FACE
DOWN
219*
224
206*
215
*204
*207
203*
223
221
*212
*211
1-7/8”
(47.5 MM)
222
CAUTION
Step 5 is critical. Follow the procedure carefully to
avoid damaging the packings by overtightening.
5. Apply one drop of adhesive, supplied, to the threads
of the piston valve. Then hand tighten the valve as-
sembly into the piston rod just until the nut (214) con-
tacts the rod.
See Fig 29.
214
TORQUE TO
10.5 in-lb (1.2 N.m)
to seat the packing,
and then back off and
tighten finger tight.
Fig 29
224
213*
205*
LIPS FACE DOWN
220*
203*
APPLY ONE DROP
OF SEALANT TO
THESE THREADS
217*
LIPS FACE UP
223
6. Place the flats at the top of the rod in a vise.
7. Use a wrench to
CAREFULLY
tighten the nut (214)
onto the piston rod to 19 ft–lbs (25 N.m).
See Fig 30.
Use two wrenches to maintain the alignment men-
tioned in Step 7, above.
Fig 30
223
214
TORQUE NUT
ONTO ROD TO
19 ft–lb
(27 N.m)
DO NOT ALLOW NUT
(214) TO MOVE
WHEN INSTALLING
PISTON ONTO ROD
8. One at a time stack the male gland (211*), the pack-
ings (218*), and then install the female gland (212*),
into the top of the cylinder (216).
See Fig 28.
9. Install the packing nut (221) and plug (201), but leave
loose for now.
See Fig 28.
10. Coat the piston rod and packings with oil. Carefully
slide the assembly into the cylinder.
11. Screw down the cylinder locknut (38) until it is finger
tight at the bottom of the external cylinder threads.
12. Place flats of the intake valve (222) in a vise. Install
a new gasket (206*). Screw the pump cylinder into
the valve. Torque to 67 ft–lb (90 N.m).
See Fig 28.
Summary of Contents for 231-081
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